I want to get a list of all the email accounts on my server

First of all I want to thank you in advance for any help that could be provided to this issue/question.

We recently moved our offices, so we want to send an email to all of our email accounts in the server, letting them know the new location of our offices, as well as inform them about some improvements and changes performed in our company.

Is there a way to get a list of all email accounts created on the hosting server? We currently manage the server ourselves, so anything that would be required to do, whereas starting a sessions in the server with the root user or something to that matter, can be completely done.

Please let me know if there's any way to get this done, for that would greatly help us.

We recently moved our offices, so we want to send an email to all of our email accounts in the server, letting them know the new location of our offices, as well as inform them about some improvements and changes performed in our company.

Is there a way to get a list of all email accounts created on the hosting server?
Francisco